Pattern programs are most commonly asked during interviews, so here in this article, we will be covering the top pattern programs in C. Moreover, the logic is universal and can be applied to different programming languages, such as C++, Java, and Python.
Pattern Programs in C
The patterns that we will be discussing are:
- Solid Rectangular Star Pattern in C
- Hollow Rectangular star Pattern in C
- Half Pyramid Star Pattern in C
- Inverted Half Pyramid Pattern in C
- Full Pyramid Star Pattern in C
- Hollow Pyramid Star Pattern
- Inverted Hollow Half pyramid in C
- Full Hollow Inverted Pyramid in C
- Half Diamond Star pattern in C
- Solid Full Diamond Pattern in C
- Right Arrow Star Pattern in C
- Left Arrow Star Pattern
- Plus Star Pattern
- X Pattern in C
- The Diagonal Hollow Square Pattern in C
- Solid Rhombus Star Pattern in C
- Hollow Rhombus Star Pattern in C
- Solid Mirrored Rhombus Pattern in C
- Hollow Mirrored Rhombus Star Pattern
- Pascal’s triangle in C
- Floyd’s Triangle in C
- Half Pyramid of Alphabets in C
- Palindrome Half Pyramid Pattern in Alphabets
- Palindrome Half Pyramid Pattern Using Numbers in C
1. Solid Rectangular Star Pattern in C
rows: 3
columns: 5
Preview
***** ***** *****
Program
#include <stdio.h>
int main()
{
int rows, columns,i,j;
printf("Enter the number of rows : ");
scanf("%d", &rows);
printf("Enter the number of columns : ");
scanf("%d", &columns);
printf("\n");
/* print solid rectangle*/
for (i = 1; i <= rows; i++)
{
for (j = 1; j <= columns; j++)
{
printf("*");
}
printf("\n");
}
return 0;
}
Output
Enter the number of rows : 3 Enter the number of columns : 5 ***** ***** *****
2. Hollow Rectangular star Pattern in C
rows: 3
columns: 5
Preview
* * * * * * * * * * * *
Program
int main()
{
int rows, columns,i, j;
printf("Enter the number of rows : ");
scanf("%d", &rows);
printf("Enter the number of columns : ");
scanf("%d", &columns);
printf("\n");
/*Logic for holow rectangle*/
for (i = 1; i <= rows; i++)
{
for (j = 1; j <= columns; j++)
{
if (i==1 || i==rows || j==1 || j==columns)
printf("*");
else
printf(" ");
}
printf("\n");
}
return 0;
}
Output
Enter the number of rows : 4 Enter the number of columns : 5 ***** * * * * *****
3. Half Pyramid Star Pattern in C
stars: 6
Preview
* ** *** **** ***** ******
Program
#include
int main()
{
int stars,i, j;;
printf("Enter the number of stars : ");
scanf("%d", &stars);
/*Logic for half Pyramid*/
for (i = 1; i <= stars; i++)
{
for (j = 1; j <= i; j++)
{
printf("*");
}
printf("\n");
}
return 0;
}
Output
Enter the number of stars : 6 * ** *** **** ***** ******
4. Inverted Half Pyramid Pattern in C
stars: 6
Preview
****** ***** **** *** ** *
Program
int main()
{
int stars,i, j;;
printf("Enter the number of stars : ");
scanf("%d", &stars);
/*Logic for inverted Pyramid*/
for (i = stars; i >= 1; i--)
{
for (j = 1 ; j <= i; j++)
{
printf("*");
}
printf("\n");
}
return 0;
}
Output
Enter the number of stars : 6 ****** ***** **** *** ** *
5. Full Pyramid Star Pattern in C
height=5
Preview
* *** ***** ******* *********
Program
#include <stdio.h>
int main()
{
int height,space,i,j,k;
printf("Enter the height of the triangle: ");
scanf("%d",&height);
space=height;
for( i=1;i<=height;i++)
{
for( j=1;j<space-1;j++)
{
printf(" ");
}
for( k=1;k<=2*i-1;k++)
{
printf("*");
}
space--;
printf("\n");
}
return 0;
}
Output
Enter the height of the triangle: 5
*
***
*****
*******
*********
6. Hollow Pyramid Star Pattern
Height of Pyramid: 6
Preview
*
* *
* *
* *
* *
***********
Program
#include<stdio.h>
int main()
{
int height,space,i,j,k;
printf("Height of Pyramid: ");
scanf("%d",&height);
space=height;
for( i=1;i<=height;i++)
{
for( j=1;j<=space-1;j++)
{
printf(" ");
}
for( k=1;k<=2*i-1;k++)
{
if(k==1 || k==2*i-1 || i==height)
printf("*");
else
printf(" ");
}
space--;
printf("\n");
}
return 0;
}
Output
Height of Pyramid: 6
*
* *
* *
* *
* *
***********
7. Inverted Hollow Half Pyramid in C
height = 7
Preview
******* * * * * * * * * ** *
Program
#include<stdio.h>
int main()
{
int height,i,j;
printf("Enter the height of Pyramid: ");
scanf("%d",&height);
for(i=height;i>=1;i--)
{
for( j=1;j<=i;j++)
{
if(j==1 || j==i || i==height)
printf("*");
else
printf(" ");
}
printf("\n");
}
return 0;
}
Output
Enter the height of Pyramid: 7 ******* * * * * * * * * ** *
8. Full Hollow Inverted Pyramid in C
height: 6
Preview
***********
* *
* *
* *
* *
*
Program
#include <stdio.h>
int main()
{
int height,space=1,i,j,k;
printf("Enter the height of pyramid: ");
scanf("%d",&height);
for( i=height;i>=1;i--)
{
for( j=1;j<space;j++)
{
printf(" ");
}
for( k=1;k<=2*i-1;k++)
{
if(k==1 || k==2*i-1 || i==height)
printf("*");
else
printf(" ");
}
space++;
printf("\n");
}
return 0;
}
Output
Enter the height of pyramid: 6
***********
* *
* *
* *
* *
*
9. Half Diamond Star Pattern in C
max stars: 7
Preview
* ** *** **** ***** ****** ******* ****** ***** **** *** ** *
Program
#include<stdio.h>
int main()
{
int max_stars,i,j;
printf("Enter the width of diamond: ");
scanf("%d",&max_stars);
for( i=1;i<=max_stars;i++)
{
for( j=1;j<=i;j++) { printf("*"); } printf("\n"); } for( i=max_stars-1;i>=1;i--)
{
for( j=1;j<=i;j++)
{
printf("*");
}
printf("\n");
}
return 0;
}
Output
Enter the width of diamond: 7 * ** *** **** ***** ****** ******* ****** ***** **** *** ** *
10. Solid Full Diamond Pattern in C
width: 7
Preview
*
***
*****
*******
*****
***
*
Program
#include<stdio.h>
int main(void) {
int width, space, stars, i, j, k;
printf("Enter the width of diamonds: ");
scanf("%d",&width);
space=width-1;
stars=1;
for( i=1;i<=width;i++)
{
for( j=1;j<=space;j++)
{
printf(" ");
}
for( k=1;k<=stars;k++) { printf("*"); } if(space>i)
{
space=space-1;
stars=stars+2;
}
if(space<i)
{
space=space+1;
stars=stars-2;
}
printf("\n");
}
return 0;}
Output
Enter the width of diamonds: 7
*
***
*****
*******
*****
***
*
11. Right Arrow Star Pattern in C
width: 7
Preview
******* ****** ***** **** *** ** * ** *** **** ***** ****** *******
Program
#include<stdio.h>
int main(void) {
int width,i,j,k;
printf("Enter the width of arrow: ");
scanf("%d",&width);
// arrow upper part
for( i=0;i<width;i++)
{
for( j=0;j<i;j++)
{
printf(" ");
}
for( k=1;k<=width-i;k++)
{
printf("*");
}
printf("\n");
}
// arrow lower part
for( i=1;i<width;i++)
{
for( j=1;j<width-i;j++)
{
printf(" ");
}
for( k=1;k<=i+1;k++)
{
printf("*");
}
printf("\n");
}
return 0;
}
Output
Enter the width of arrow: 7 ******* ****** ***** **** *** ** * ** *** **** ***** ****** *******
12. Left Arrow Star Pattern
width : 6
Preview
******
*****
****
***
**
*
**
***
****
*****
******
Program
#include<stdio.h>
int main(void) {
int width,i,j,k;
printf("Enter the width of arrow: ");
scanf("%d",&width);
for( i=1;i<=width;i++)
{
for( j=1;j<=width-i;j++)
{
printf(" ");
}
for( k=0;k<=width-i;k++)
{
printf("*");
}
printf("\n");
}
for( i=1;i<width;i++)
{
for( j=1;j<i+1;j++)
{
printf(" ");
}
for( k=1;k<=i+1;k++)
{
printf("*");
}
printf("\n");
}
return 0;
}
Output
Enter the width of arrow: 6
******
*****
****
***
**
*
**
***
****
*****
******
13. Plus Star Pattern
height: 7
Preview
+ + + +++++++ + + +
Program
#include<stdio.h>
int main(void) {
int height,i,j;
printf("Enter the height (odd): ");
scanf("%d", &height);
for( i=1;i<=height;i++)
{
if(i==((height/2)+1))
{
for( j=1;j<=height;j++)
{
printf("+");
}
}
else
{
for( j=1;j<=height/2;j++)
{
printf(" ");
}
printf("+");
}
printf("\n");
}
return 0;
}
Output
Enter the height (odd): 7 + + + +++++++ + + +
14. X Pattern in C
width: 6
Preview
* *
* *
* *
* *
* *
*
* *
* *
* *
* *
* *
Program
#include<stdio.h>
int main(void) {
int width,space, i,j;
printf("Enter the width: ");
scanf("%d",&width);
space=2*width-1;
for( i=1;i<=space;i++)
{
for( j=1;j<=space;j++)
{
if(i==j || j==(space-i+1))
{
printf("*");
}
else
{
printf(" ");
}
}
printf("\n");
}
return 0;
}
Output
Enter the width: 6
* *
* *
* *
* *
* *
*
* *
* *
* *
* *
* *
15. The Diagonal Hollow Square Pattern in C
rows: 8
Preview
******** ** ** * * * * * ** * * ** * * * * * ** ** ********
Program
#include<stdio.h>
int main()
{
int rows, i, j;
printf("Enter rows: ");
scanf("%d",&rows);
for( i=1;i<=rows;i++)
{
for( j=1;j<=rows;j++)
{
if(i==1 ||i==rows||j==1||j==rows-i+1||i==j||j==rows)
{
printf("*");
}
else
{
printf(" ");
}
}
printf("\n");
}
return 0;
}
Output
Enter rows: 8 ******** ** ** * * * * * ** * * ** * * * * * ** ** ********
16. Solid Rhombus Star Pattern in C
rows: 7
Preview
*******
*******
*******
*******
*******
*******
*******
Program
#include<stdio.h>
int main()
{
int rows, i,j,k;
printf("Enter rows: ");
scanf("%d",&rows);
for( i=rows;i>=1;i--)
{
for( j=1;j<=i-1;j++)
{
printf(" ");
}
for( k=1;k<=rows;k++)
{
printf("*");
}
printf("\n");
}
return 0;
}
Output
Enter rows: 7
*******
*******
*******
*******
*******
*******
*******
17. Hollow Rhombus Star Pattern in C
rows: 7
Preview
*******
* *
* *
* *
* *
* *
*******
Program
#include<stdio.h>
int main()
{
int rows,i,j,k;
printf("Enter rows: ");
scanf("%d",&rows);
for( i=rows;i>=1;i--)
{
for( j=1;j<=i-1;j++)
{
printf(" ");
}
for( k=1;k<=rows;k++)
{
if(i==1 || i==rows || k==1 || k==rows)
printf("*");
else
printf(" ");
}
printf("\n");
}
return 0;
}
Output
Enter rows: 7
*******
* *
* *
* *
* *
* *
*******
18. Solid Mirrored Rhombus Pattern in C
rows: 7
Preview
*******
*******
*******
*******
*******
*******
*******
Program
#include<stdio.h>
int main()
{
int rows,i,j,k;
printf("Enter rows: ");
scanf("%d",&rows);
for( i=1;i<=rows;i++)
{
for( j=1;j<i;j++)
{
printf(" ");
}
for( k=1;k<=rows;k++)
{
printf("*");
}
printf("\n");
}
return 0;
}
Output
Enter rows: 7
*******
*******
*******
*******
*******
*******
*******
19. Hollow Mirrored Rhombus Star Pattern
rows: 7
Preview
*******
* *
* *
* *
* *
* *
*******
Program
#include
int main()
{
int rows, i,j,k;
printf("Enter rows: ");
scanf("%d",&rows);
for( i=1;i<=rows;i++)
{
for( j=1;j<i;j++)
{
printf(" ");
}
for( k=1;k<=rows;k++)
{
if(i==1 || i==rows || k==1 || k==rows)
printf("*");
else
printf(" ");
}
printf("\n");
}
return 0;
}
Output
Enter rows: 7
*******
* *
* *
* *
* *
* *
*******
20. Pascal’s Triangle in C
rows: 6
Preview
1
2 3 2
3 4 5 4 3
4 5 6 7 6 5 4
5 6 7 8 9 8 7 6 5
6 7 8 9 10 11 10 9 8 7 6
Program
#include <stdio.h>
int main() {
int i, s, r, k = 0, c1 = 0, c2 = 0;
printf("Enter rows(r): ");
scanf("%d", &r);
for (i = 1; i <= r; ++i) {
for (s = 1; s <= r - i; ++s) {
printf(" ");
++c1;
}
while (k != 2 * i - 1) {
if (c1 <= r - 1) {
printf("%d ", i + k);
++c1;
} else {
++c2;
printf("%d ", (i + k - 2 * c2));
}
++k;
}
c2 = c1 = k = 0;
printf("\n");
}
return 0;
}
Output
Enter rows(r): 6
1
2 3 2
3 4 5 4 3
4 5 6 7 6 5 4
5 6 7 8 9 8 7 6 5
6 7 8 9 10 11 10 9 8 7 6
21. Floyd’s Triangle in C
rows: 6
Preview
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Program
#include<stdio.h>
int main() {
int rows, i, j, n = 1;
printf("Enter rows: ");
scanf("%d", &rows);
for (i = 1; i <= rows; i++) {
for (j = 1; j <= i; ++j) {
printf("%d ", n);
++n;
}
printf("\n");
}
return 0;
}
Output
Enter rows: 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
22. Half Pyramid of Alphabets in C
Last Alphabet: F
Preview
A B B C C C D D D D E E E E E F F F F F F
Program
#include<stdio.h>
int main() {
int i, j;
char input, alphabet = 'A';
printf("Enter an uppercase character you want to print in the last row: ");
scanf("%c", &input);
for (i = 1; i <= (input - 'A' + 1); ++i) {
for (j = 1; j <= i; ++j) {
printf("%c ", alphabet);
}
++alphabet;
printf("\n");
}
return 0;
}
Output
Enter an uppercase character you want to print in the last row: F A B B C C C D D D D E E E E E F F F F F F
23. Palindrome Half Pyramid Patterns in Alphabets
rows: 5
Preview
A ABA ABCBA ABCDCBA ABCDEDCBA ABCDEFEDCBA
Program
#include
int main() {
int i, j, rows, c=0;
printf("Enter rows: ");
scanf("%d", &rows);
for (i = 1; i <= 2*rows; i=i+2) {
for (j = 1; j <= i; j++) {
printf("%c", 'A'+c);
if(j <= i/2)
c++;
else
c--;
}
c = 0;
printf("\n");
}
return(0);
}
Output
Enter rows: 6 A ABA ABCBA ABCDCBA ABCDEDCBA ABCDEFEDCBA
Note: Check out C program to print a triangle of alphabets.
24. Palindrome Half Pyramid Pattern Using Numbers in C
rows: 6
Preview
1 121 12321 1234321 123454321 12345654321
Program
#include
int main() {
int i, j,k, rows, c=0;
printf("Enter rows: ");
scanf("%d", &rows);
for(i=1; i<=rows; i++)
{
for(j=1;j<=i;j++) { printf("%d",j); } for(k=i-1;k>=1;k--)
{
printf("%d",k);
}
printf("\n");
}
return(0);
}
Output
Enter rows: 6 1 121 12321 1234321 123454321 12345654321
Conclusion
Those were some of the most popular pattern programs in C. What are your favorite pattern programs? Let us know in the comments.
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